the description for them says they're meant to be obtained by completing your discovery queue, but I haven't actually looked at it all. i've gotten three of these things daily so far, and I also have confirmed that the titles viewed in queue count has actually stayed the same, so it's not like there's someone who's snuck into my account and is looking at my queue for me or anything... (plus, if someone did hack into my account I think I would have bigger problems lmao)
i'm gonna assume this is just a bug? i guess i'm not complaining for the free items, but it's kind of funny...